balanced polymorphism

常见例句

双语例句

• Thus, a genetic polymorphism of species in a balanced equilibrium cannot be established.
  因此于 平衡状态下，物种之「基因多态性」并无法完成。
  http://dj.iciba.com

权威例句

• If it does, such an advantage probably pertains only when psychopaths are in the minority (a state of affairs known to biologists as a balanced polymorphism).
  ECONOMIST: Evidence that psychopaths are born, not made
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